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Benzenoid diradicals

The biological activity of calicheamicin 4 (simplified structure) is based on the ability to damage DNA. At the reaction site, initially the distance between the triple bonds is diminished by an addition reaction of a sulfur nucleophile to the enone carbon-carbon double bond, whereupon the Bergman cyclization takes place leading to the benzenoid diradical 5, which is capable of cleaving double-stranded DNA." ... [Pg.40]

The names p-xylylene and p-quinodimethane might indicate two different electronic states of the same species. Etymologically, the former is a benzenoid diradical (paramagnetic), while the latter is its isomeric quinonoid structure (diamagnetic). Actually, those names are frequently used interchangeably, regardless of the electronic state. [Pg.390]

See other pages where Benzenoid diradicals is mentioned: [Pg.523]    [Pg.431]    [Pg.393]    [Pg.2565]    [Pg.56]    [Pg.170]    [Pg.203]    [Pg.206]    [Pg.208]    [Pg.216]    [Pg.223]    [Pg.224]    [Pg.162]    [Pg.180]    [Pg.180]    [Pg.111]    [Pg.894]    [Pg.166]    [Pg.191]    [Pg.191]    [Pg.108]    [Pg.131]   
See also in sourсe #XX -- [ Pg.162 ]



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1,4-benzenoid diradical

1,4-benzenoid diradical

Benzenoids

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Diradical

Diradicals

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